1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.telecom; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.IntentFilter; 23 import android.media.AudioManager; 24 25 import com.android.internal.util.IndentingPrintWriter; 26 27 import java.util.Collections; 28 import java.util.Set; 29 import java.util.concurrent.ConcurrentHashMap; 30 31 /** Listens for and caches headset state. */ 32 class WiredHeadsetManager { 33 interface Listener { onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn)34 void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn); 35 } 36 37 /** Receiver for wired headset plugged and unplugged events. */ 38 private class WiredHeadsetBroadcastReceiver extends BroadcastReceiver { 39 @Override onReceive(Context context, Intent intent)40 public void onReceive(Context context, Intent intent) { 41 if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) { 42 boolean isPluggedIn = intent.getIntExtra("state", 0) == 1; 43 Log.v(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b", 44 isPluggedIn); 45 onHeadsetPluggedInChanged(isPluggedIn); 46 } 47 } 48 } 49 50 private final WiredHeadsetBroadcastReceiver mReceiver; 51 private boolean mIsPluggedIn; 52 /** 53 * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is 54 * load factor before resizing, 1 means we only expect a single thread to 55 * access the map so make only a single shard 56 */ 57 private final Set<Listener> mListeners = Collections.newSetFromMap( 58 new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1)); 59 WiredHeadsetManager(Context context)60 WiredHeadsetManager(Context context) { 61 mReceiver = new WiredHeadsetBroadcastReceiver(); 62 63 AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); 64 mIsPluggedIn = audioManager.isWiredHeadsetOn(); 65 66 // Register for misc other intent broadcasts. 67 IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG); 68 context.registerReceiver(mReceiver, intentFilter); 69 } 70 addListener(Listener listener)71 void addListener(Listener listener) { 72 mListeners.add(listener); 73 } 74 removeListener(Listener listener)75 void removeListener(Listener listener) { 76 if (listener != null) { 77 mListeners.remove(listener); 78 } 79 } 80 isPluggedIn()81 boolean isPluggedIn() { 82 return mIsPluggedIn; 83 } 84 onHeadsetPluggedInChanged(boolean isPluggedIn)85 private void onHeadsetPluggedInChanged(boolean isPluggedIn) { 86 if (mIsPluggedIn != isPluggedIn) { 87 Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn, 88 isPluggedIn); 89 boolean oldIsPluggedIn = mIsPluggedIn; 90 mIsPluggedIn = isPluggedIn; 91 for (Listener listener : mListeners) { 92 listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn); 93 } 94 } 95 } 96 97 /** 98 * Dumps the state of the {@link WiredHeadsetManager}. 99 * 100 * @param pw The {@code IndentingPrintWriter} to write the state to. 101 */ dump(IndentingPrintWriter pw)102 public void dump(IndentingPrintWriter pw) { 103 pw.println("mIsPluggedIn: " + mIsPluggedIn); 104 } 105 } 106